Thread: string problem

Originally Posted by INeedSleep

i think i pretty much finished these levels:

Add (Level 3) to use functions to break your program into more manageable pieces. I'd recommend the bounds checking code for the user's number and the display of the result. In fact, that results display itself could be broken down into a couple of functions: random pre-message and random post-message (with the result itself printed between these calls).

You can add another (Level 1.5) to place the repetitious pattern of converting [each digit of] the user's number into A re-usable function.

i have to look over the code more throughly

Code:

//updated 11/7/07
// Jason helped:  Wed Nov  7 15:49:56 CST 2007
#include <cctype>
#include <string>
#include <iostream>
#include <climits>
using namespace std;

// single digit n, three char string with ones digit in position 0,
// fives digit in position 1, and tens digit in position 2.  returns
// digit n represented in Roman numeral form.
string to_roman(short n, const string & OneFiveTen);

int main()
{

   char ans='y';
   string roman;
   short input; //user input

//string names converted to roman numerals
   const string rome1="I";
   const string rome5="V";
   const string rome10="X";
   const string rome50="L";
   const string rome100="C";
   const string rome500="D";
   const string rome1000="M";

   while(tolower(ans)=='y')
   {
      cout<<"what number would you like to convert?:\n";
      cin>>input;
      cin.ignore(INT_MAX, '\n');

      if(input>0 && input<4000 )
      {
  
         roman="";
  
  //thousands place to get remainder(1000-3000)
         roman = roman + to_roman(input/1000, rome1000);
    
   //hundreds place to get remainder(100-300)
         roman = roman + to_roman(input%1000/100, rome100+rome500+rome1000);

   //tens place
         roman = roman + to_roman(input%100/10, rome10+rome50+rome100);

   //ones place
         roman = roman + to_roman(input%10, rome1+rome5+rome10);
   
         cout << "that is converted from a" <<" " << input << " "
              <<"into" << " " << roman <<" " << "in roman numerals\n";
         cout << "would you like to try again?";
         cin >> ans;
      }
   
      else
      {
         ans='n';
         cout<<"then get the f*&k out then !";
      }
   
      if(ans =='y' || ans =='Y')
      {
         cout<<"dont come the f@*k back !";
      }
  
   }
 
   return 0;
}

// single digit n, three char string with ones digit in position 0,
// fives digit in position 1, and tens digit in position 2.  returns
// digit n represented in Roman numeral form.
string to_roman(short n, const string & OneFiveTen)
{
   string in_roman;
   short i;
   if( n == 4 || n == 9) // handle 4 and 9 separately
   {
      in_roman=OneFiveTen[0];
      if(n==4)
      {
         in_roman+=OneFiveTen[1];
      }
      else // if(n==9)
      {
         in_roman+=OneFiveTen[2];
      }
   }
   else
   {
      if(n>=5) // handle 5 ..and start 6,7,8
      {
         in_roman+=OneFiveTen[1];
         n=n-5;
      }
      i=1;
      while(i<=n)
      {
         in_roman+=OneFiveTen[0];
         i=i+1;
      }
   }
   return in_roman;
}

ignore the "then get the f*&k out then !" and "dont come the f@*k back !"

Jason is my professor, btw

^
teacher never covered for loops, only while
i was thinking about doing it, but i dont want to risk getting anything marked off

i'll put it in and show it to him later today and see what he says

anyway, i started this program a few hours ago:
http://home.earthlink.net/%7Ecraie/121/labs/suffix.html

i will post my code later on today

*finding the suffix*

i'm in the real early stages
i have the formulas for the special cases and for the regular cases

Code:

#include <iostream>
#include <string>
using namespace std;
int main()
{


//char ans = 'y';
double left_numbers;//numbers left over
short input;//user input
       

string suffix_1 = "st";
string suffix_2 = "nd";
string suffix_3 = "rd";
string suffix_beyond = "th";

cout<<"what is your number?\n";
cin>>input;

//special cases 
left_numbers = input &#37; 100;


//ordinary cases
//left_numbers = input % 10;



      
//special cases 11-13
if( (left_numbers <=13) && (left_numbers >= 11)  )
{
cout<<input<<suffix_beyond;
}

/*
//suffix for 0
else if(left_numbers == 0)
{
cout<<input<<suffix_beyond;
}


//suffix for 1
else if(input % 10 == 1  )
{
cout<<input<<suffix_1;
}
*/

else
{
cout<<"done";
}

return 0;
}

btw, i'm adding a loop after i get the basics to work first

i finally got the basic code to work

Code:

#include <iostream>
#include <string>
using namespace std;
int main()
{

short left_numbers,last_number;//numbers left over
long input;//user input
       
string suffix_1 = "st";
string suffix_2 = "nd";
string suffix_3 = "rd";
string suffix_beyond = "th";

cout<<"what is your number?\n";
cin>>input;

left_numbers = input % 100;//special cases 
last_number = input % 10;//ordinary cases 0,1,2,etc


  if( (left_numbers <=13) && (left_numbers >= 11)  )//special cases 11-13
  {
  cout<<input<<suffix_beyond;
  }

     else if(last_number == 1)//suffix for 1
    {
    cout<<input<<suffix_1;
    }

         else if(last_number == 2)//suffix for 2
         {
         cout<<input<<suffix_2;
         }

             else if(last_number == 3)//suffix for 3
            {
            cout<<input<<suffix_3;
            }

               else
              {
              cout<<input<<suffix_beyond;
              }

return 0;
}

now i need to add all of these(or most)

Add (Level 2) to use functions to break your program into more manageable pieces. I'd recommend the display of the result go into a function to de-clutter the main.
In fact, you can probably break out another function from the results-display: the random pre-message generation.

If you do, I'll throw in another (Level 1.5) to make just the random number formula into an inline function.

You can add a special (Level 1.5) to place your suffix-determining code in a generic/re-usable function.

Add (Level 1.5) to place your suffix function in a library.

Add (Level 1.5) to place your random number generation function in a library.

need help with starting anyone of these.

How did the roman numeral conversion work out? Or is this somehow part of it?